HYDROGEN STORAGE EMPLOYING MG-10 WT-PERCENT NI-ALLOY

Two prototypes were developed for different capacities and kinetics of hydrogen storage as hydrides: single tube (ST) and multitube (MT) models. The ST can absorb up to 0.3 NmH-3(2). It is based on a unique tube design employing an external helicoidal fin. Air is used for head exchange. The MT model can absorb 1 NmH-3(2) and is composed of an array of 37 tubes interconnected in parallel. In this case, oil is used for heat exchange. For both models, the hydrogen absorption desorption performances are presented using the high-temperature hydride former Mg-10wt% Ni (260-300-degrees-C). The utilization of a room-temperature hydride former, like rare-earth (LaNi5)- and Ti-Zr-based alloys (Laves phases), is also possible. We conclude that the ST model resulted in better kinetics for hydrogen absorption-desorption, lower cost, and more reliable operation than the MT model.